High glycoantigen 199 mainly suggests tumors of the gastrointestinal tract. If there are tumors of pancreatic cancer, colorectal cancer, gastric cancer and other sources, glycoantigen 199 will be significantly elevated. The main reason is to see if there are tumors in these areas: 1. to do CT scan plus enhancement of the whole abdomen to see if there are any occupying lesions in these organs, the patient is a localized thickening of the stomach and intestinal canal. 2. mainly to do pathological examination, for the pancreas can do puncture biopsy, for stomach cancer, intestinal cancer, colon cancer, etc., mainly to do endoscopy of the gastrointestinal tract, after clamping the pathological tissue under the microscope to see if cancer cells can be found. If cancer cells can be found, the diagnosis of gastric cancer or colorectal cancer can be confirmed. If cancer cells can be found, the diagnosis of gastric cancer or colorectal cancer can be confirmed. Therefore, a high glycogen 199 can be a diagnostic indicator, but not a diagnostic indicator.